Maybe.... and maybe they were professionally redone with the cam swap and have a 5 angle valve job....
Read his question again: "My question is, what heads would you recommend for my situation" Look, it's this simple: The Op wanted to know "what heads" to make 350+ hp. I said "J" heads will work for that goal. I stand by that. IF his are junk, then they are junk. He didn't ASK if his were good. He ASKED what heads to reach a goal, and I answered the question. :)
Now, feel free to answer the OP's question and say what heads YOU would recommend :)